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18 <br />• 1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />• 13 <br />• <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />that we've been seeing coming through our office for <br />permit purposes. <br />Essentially it's a double-l:tned system <br />with a leak detection in between the two layers. <br />The lowermost liner, the secondary liner, its about <br />a one foot compacted soils liner amended with <br />bentonite. The company has committed to achieving <br />a permeability of ten to the minus six centimeters <br />per second which we feel is fairly impermeable. <br />Immediately above the secondary liner <br />will be a one-foot sand and gravel leak detection <br />system. It will be -- well, there will be riser <br />pipes. I don't recall what they're made out of <br />offhand, PVC or HDPE -- there will be riser pipes <br />completed in sumps beneath the pad within the leak <br />detection area. These risers will be monitored for <br />fluids during the course of operations, <br />Immediately above the leak detection <br />layer will be a 60-mill HDPE anchored liner, and <br />that will cover the entire heap area. <br />The heap itself will be constructed to <br />approximately a hundred feet in height. It will be <br />constructed in six distinct stages, more or less in <br />a radial fashion. The heap will achieve the <br />hundred-foot height by creation of five 20-foot <br />